How to get output voltage from the tachometer output

[fadli]

I have an assignment to find out the transfer function for the dc motor. In order
to get the transfer function for the dc motor, I need to get the dc motor graph, that means output voltage versus time when we applied step input to the dc motor. The problem is, the output of dc motor is in RPM. so I need to use the tachometer to get the speed of dc motor. So, what types of tachometer that can connected to oscilloscope in order to show the output voltage which represent the RPM value. other way, how to get the output voltage for dc motor.

 

[FredGarvin]

We use simple magnetic pick ups a lot of times. We put a small wheel with interruptions or use gear teeth as the triggers. When the triggers pass the pick up it gives you a pulse and thus a speed based frequency.

 

[ravenprp]

To get the output voltage from the tachometer output, you will need to use a tachometer that has a voltage output signal. This type of tachometer is typically called a "voltage output tachometer" or "analog tachometer". These tachometers usually have a voltage range of 0-5V or 0-10V, which can be connected to an oscilloscope to display the output voltage.

To find the transfer function for the dc motor, you will need to plot the output voltage versus time when a step input is applied to the motor. This can be done by connecting the voltage output tachometer to the motor and recording the output voltage using an oscilloscope.

If you do not have access to a voltage output tachometer, you can also calculate the output voltage by using the formula V = ω * K, where V is the output voltage, ω is the angular speed in radians per second, and K is the tachometer constant. The tachometer constant can be found in the tachometer's specifications or by conducting a calibration test.

In summary, to get the output voltage from the tachometer output, you will need to use a voltage output tachometer or calculate it using the formula mentioned above. This will allow you to obtain the transfer function for the dc motor and analyze its performance.